Division contrivance for centrifugal bowls.



No 79?,13. PATENTED AUG. 15, 1905. B. LJUNGSTRGME DIVISION GONTRIVANUE FOR GENTRIFUGAL BOWLS.

APPLIOATION FILED JAN. 7. 1905.

ANDREW a Gamma co, Pmmumoummtns. w-snwsvou. n c,

r STATES PATENT OFFTUE.

lBIRGER LJUNGSTRQM, OF STOCKHOLM, SWEDEN, ASSIGNOR TO AKTIE- BULAGET SEPARATOR, OF STOCKHOLM", SWEDEN A COMPANY.

UlVlISlUIN @UTIFWVANQE F'CDW ffiENTRIF'LlC-WM... HUWLS.

Specification of Letters Patent.

Patented Aug. 15, 1905.

Application filed January '7, 1905. Serial No. 240,109.

To 11,7], whom it may concern.-

Be it known that I, BIRenR LJUNGSTROM, a subject of the King of Sweden and Norway, residing at Stockholm, Sweden, have invented certain new and useful Improvements in Division Contrivances for Centrifugal Bowls; and T do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to division-plates which are used in liners for centrifugal bowls for increasing the capacity of the bowl and which intersect the radial line of the bowl, thereby dividing the body of liquid into thin layers. Such division contrivances generally consist either of superposed conical disks or of an annular series of vertical curved plates, the plates generally being attached to each other at their inner edges by hinges or links. Plates of the one or the other of these kinds ought to have sufficient resistance to withstand the transformations in form which they are exposed to in cleaning or in consequence of the effect of the centrifugal force. As the skimming capacity of the liner is directly dependent on the number of the divisionplates, they are usually made as thin as possible. Thus in order to stiffen the plates, more especially conical plates, the same are generally provided with edges bent at angles inwardly and outwardly at a right angle to the axis of the bowl. Hereby it was possible to decrease the thickness of the plates a little, and thus make room for a greater number of plates.

The present invention has for its object to decrease the thickness of the plates still more, though at the same time retaining their power of resistance against transformations in form, whereby a considerably greater number of plates may be inserted than before in a bowl of the same height. For this purpose the mantles of the conical plates are made, essentially, thinner than the edges. This is attained either by forming the plates of a thin sheet of metal of the desired thickness of the mantles and afterward strengthening the edges, or the plates are made of a thickness that the edges are to have and the mantles afterward made thinner in any suitable manner.

in the accompanying drawings, in which like parts are similarly designated, Figure 1 is a vertical sectional view of a centrifugal bowl with one form of my improved conical plate inserted therein. Fig. 2. is a vertical sectional view of a plate, showing one means of stiffening the edge. Fig- 3 is a like View of another form of plate; Fig. 4L is a section of a vertical curved plate in perspective, showing the thickened flanges or edges.

In Fig. 1, a designates a bowl, I) the cover, 0 the central feed-pipe, all of which are of wellknown construction, and (Z designates the plates having thicker outer edges 6.

In Figs. 3 and 4 other forms of plates are shown, and in both examples the metal is thicker at the edges than the mantles. In Fig. 2, however, the metal in the plate is of the same thickness throughout, with the edge bent over or lapped, as at c, to form a thicker stronger flange.

In a liner consisting of superposed conical plates or disks the space in the direction of the axis of the bowl between the edges of two adjacent plates is to the perpendicular space between the mantles as l sin. Where is the angle of inclination of the generatrice against the axis of the bowl. By decreasing the spaces in the direction of the axis of the bowl the perpendicular spaces between the mantles of the plates are not, as will thus be seen, decreased in the same degree. It is hereby now made possible to place an essentially greater number of conical plates in a bowl of a fixed height than before without decreasing the spaces between the mantles, and by this means increase the skimming capacity of the liner.

The plates may, as mentioned above, be made of very thin sheeting, whereupon the bent edges are provided with strengtheningrings or the edges may be folded or plaited one or more times, or the disks may be made of a relatively thick sheet of iron, whereupon the mantles are made thinner, preferably by turning elf, whereas the thickness of the edges is maintained. The edges need not be bent at right angles to the axis of the bowl. Especially the edges on the base of the conical disks are bent somewhat upward, preferably at right angles to the mantles.

I do not limit myself to conical disks or plates, my improvement being also applicable to plates of other kinds as, for instance, to Vertical curved plates intersecting the radial line of the bowl.

1 claim as my invention- 1. A division-plate for liners of centrifugal bowls intersecting the radial line of the bowl,

tersecting the radial line of the bowl, the upper and lower ends of said disks being bent at an angle and being of greater thickness than the mantles of the conical disks.

4. Division contrivance for liners of centrifugal bowls consisting of conical disks intersecting the radial line of the bowl, the upper and lower ends of said disks being bent at about right angles to the mantles and being of greater thickness than said mantles.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses BIRGER LJUNGsTRoM.

Witnesses:

TH. WAW'RINSKY, A. E. KULLBERG. 

